Gonzalo M.

Demo profile

Backend Engineer - APIs for Mobile Apps

Mendoza, Argentina·5+ years·Spanish / English

Bio

I design APIs that mobile developers love. 5 years building backends for iOS and Android apps with a focus on efficiency and offline-first architecture. I understand data sync, push notifications, and API versioning. Systems engineering student who dropped out to work full-time. My endpoints are well-documented, my error messages are helpful, and I version my APIs properly from day one.

Skills

Node.jsTypeScriptPostgreSQLREST APIsRedisDocker

Work style

Systems thinkerGreat documentationStraight shooter

Portfolio (sample case studies)

Real-time Collaboration Dashboard

Sample

Built multi-user dashboard with live updates using WebSockets and optimistic UI. Handled conflict resolution and implemented robust offline-first architecture.

Node.js

SaaS Billing & Subscription System

Sample

Designed and implemented complete subscription management with Stripe. Handled proration, dunning, usage tracking, and admin billing tools.

Node.jsPostgreSQL

Payment Integration for Cross-border Platform

Sample

Integrated multiple payment providers with currency conversion, fee calculations, and payout automation.

Node.jsREST APIs

Analytics Dashboard for B2B SaaS

Sample

Created complex reporting dashboard with custom date ranges, exports, and drill-down capabilities. Optimized queries to handle millions of events.

PostgreSQLTypeScript